I'm pro whatever is cheapest and fastest. Which just isn't nuclear. For every GW of nuclear coming online, there are hundreds of wind and solar GW coming online. An order of magnitude more power in an order of magnitude less time. And things are getting cheaper and faster still. Fifteen years from now that will be a lot cheaper and faster. Any plan that does not take that into account is not a great plan. And my problem with many of these nuclear startups is that they don't seem to do that. They are reluctant to talk about cost because it's a weakness and a problem for which they have no solution.
We're in a weird transition phase where gas/coal generation still exists and matters but have obvious financial challenges that are getting worse very quickly. Courtesy of the Russians, everybody is well aware of that now and can look forward to some really steep energy bills in the next year. But investors have been voting with their feet long before that happened as this has been quite obvious for a while now. Coal plants have been shutting down in many countries mainly for cost reasons and with a few exceptions (China, India), very few countries are building new ones. And now that cheap Russian gas is not an option, gas plants just got a lot more expensive to operate and they were already too expensive before that. Basically, that's an industry that is experiencing a rapidly accelerating collapse. It won't take until 2050 for that to be completed.
The only remaining debate is how soon we'll turn the remaining plants off. That's mostly a function of production capacity for solar and wind generation and energy storage solutions. More investment is flowing into that industry every year and we're seeing massive sustained growth there for decades in term of new capacity coming online every year. It's a super profitable industry to be in and a lot of those profits are getting reinvested in more and even better stuff. Lots of countries have been revising their already ambitious plans to become carbon neutral to be even more ambitious as they find themselves beating their own expectations of just a few years ago on this front. Ten years from now, a lot of countries will get the vast majority of their power from renewables and the remaining ones will be busy figuring out how to get in on the action.
Nuclear is getting lots of attention and investment obviously. But planned new capacity does not add up to mattering much at all over the next fifteen years. A few GW here and there vs. hundreds of GW in the next few years alone. And it takes that long to plan more nuclear plants and there are very little signs of countries warming up to that notion. A lot of those nuclear startups you mentioned won't hit volume production (if they survive long enough) before most countries have shut down all their remaining coal and gas plants. Which in Germany would be around 2035 according tot he latest plans. And those plans don't seem to involve any nuclear. Of course, that timeline might be accelerated due to recent events..